Make DisplayItemClient an interface

third_party/WebKit/Source/platform/graphics/paint/ClipPathRecorder.h

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef ClipPathRecorder_h
 #define ClipPathRecorder_h
 
 #include "platform/graphics/Path.h"
 #include "platform/graphics/paint/DisplayItemClient.h"
 #include "wtf/Allocator.h"
 #include "wtf/Noncopyable.h"
 
 namespace blink {
 
 class GraphicsContext;
 
 class PLATFORM_EXPORT ClipPathRecorder {
     USING_FAST_MALLOC(ClipPathRecorder);
     WTF_MAKE_NONCOPYABLE(ClipPathRecorder);
 public:
-    ClipPathRecorder(GraphicsContext&, const DisplayItemClientWrapper&, const Path&);
+    ClipPathRecorder(GraphicsContext&, const DisplayItemClient&, const Path&);
     ~ClipPathRecorder();
 
 private:
     GraphicsContext& m_context;
-    DisplayItemClientWrapper m_client;
+    const DisplayItemClient& m_client;
 };
 
 } // namespace blink
 
 #endif // ClipPathRecorder_h